Characterizing Interference Mitigation Techniques in Dense 60 GHz mmWave WLANs
Characterizing Interference Mitigation Techniques in Dense 60 GHz mmWave WLANs
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DOI：
10.1109/icccn.2019.8847085
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发表时间：
2019-07
期刊：
影响因子：
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通讯作者：
Ding Zhang;P. Santhalingam;Parth H. Pathak;Zizhan Zheng
中科院分区：
文献类型：
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作者：
Ding Zhang;P. Santhalingam;Parth H. Pathak;Zizhan Zheng
在60 GHz WLAN中密集部署接入点，可为移动的客户端提供始终在线的千兆位连接和抗阻塞能力。然而，这种密集部署可能导致链路之间的有害干扰，影响链路数据速率。在本文中，我们试图更好地了解使用802.11ad COTS设备和60 GHz软件无线电为基础的测量的干扰特性和干扰缓解技术的有效性。我们首先发现，当前的802.11ad COTS设备在扇区选择时没有考虑干扰，导致高干扰和低空间重用。我们考虑三种技术的干扰缓解-信道化，扇区选择和接收波束成形。首先，我们的研究结果表明，信道化是有效的，但60 GHz的信道有不可忽略的相邻和非相邻信道干扰。其次，我们表明可以进行干扰感知的扇区选择来减少干扰，但在有反射的室内环境中，其收益可能会受到限制，并且这种扇区选择应考虑介质接入的公平性并避免非对称干扰。第三，我们描述了接收波束成形在对抗干扰方面的有效性，并量化了搜索接收扇区所涉及的相关开销，特别是在存在阻塞的情况下。我们详细阐述了通过表征所获得的见解，并通过研究指出了重要的突出问题。
Dense deployment of access points in 60 GHz WLANs can provide always-on gigabit connectivity and robustness against blockages to mobile clients. However, this dense deployment can lead to harmful interference between the links, affecting link data rates. In this paper, we attempt to better understand the interference characteristics and effectiveness of interference mitigation techniques using 802.11ad COTS devices and 60 GHz software radio based measurements. We first find that current 802.11ad COTS devices do not consider interference in sector selection, resulting in high interference and low spatial reuse. We consider three techniques of interference mitigation - channelization, sector selection and receive beamforming. First, our results show that channelization is effective but 60 GHz channels have non-negligible adjacent and non-adjacent channel interference. Second, we show that it is possible to perform interference-aware sector selection to reduce interference but its gains can be limited in indoor environment with reflections, and such sector selection should consider fairness in medium access and avoid asymmetric interference. Third, we characterize the efficacy of receive beamforming in combating interference and quantify the related overhead involved in the search for receive sector, especially in presence of blockages. We elaborate on the insights gained through the characterization and point out important outstanding problems through the study.